I posted this in other powertrain but they hollered at me to move it so here it is....2006 fx4 screw 5.4....Just ordered a Fabtech 6" w/ d.l. I already have a 1.5" lift shackle in the rear, will my pinion angles be ok, or should i order shims so they arive with the lift?? i dont want to tear everything apart twice, or drive from when i install it to my house and have it vibrate my teeth out. If anyone has this setup or an aal could you chime in please...

THANKS

...i already searched...